(car (cdr (car (cdr (cdr (list 1 3 (list 5 7) 9))))))

(car (car (list (list 7))))

(car (cdr
      (car (cdr
            (car (cdr
                  (car (cdr
                        (car (cdr
                              (car (cdr (list 1 (list 2 (list 3 (list 4 (list 5 (list 6 7))))))))))))))))))